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Rates of Reaction Investigation

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Wednesday, 13 February 2002 Rates of Reaction Introduction I will be conducting an experiment on "rates of reaction" for my GCSE coursework. We will be reacting sodium thiosulphate with hydrochloric acid. I will be investigating the effects had on rate of reaction and to find out the how the temperature will effect the rate of reaction between sodium thiosulphate and hydroclolic acid. When sodium thiosulphate and hydrochloric are mixed, a yellow precept of sulphur is produced. The solution becomes increasingly difficult to see through as more and more sulphur is formed. Prediction The higher the temperature, the less time it will take to go cloudy. ...read more.


Put the conical flask in with the beaker. Keep checking the temperature by using thermometer. When it gets to the wanted temperature, take the conical flask out and put it on the piece of paper with the cross on it. Add 20ml of hydrochloric acid then start the stop-clock. You then have to wait for the mixture in the flask to go a cloudy colour so you cannot see the cross on the piece of paper. Once it has done this stop the stop-clock and make note of the time. This is then done for the rest of the temperatures. This will be made a fair test by not stirring the hydrochloric acid and do the exact same procedure to the other tests. ...read more.


My prediction was: "The higher the temperature, the less time it will take to go cloudy" I found out that this was true. Improvements The experiments were handled fairly but it could have been even fairer because the reaction was finished when the black cross on the pad disappeared and this is only seen by the naked eye. With the whole class doing this with different eye types, there is no exact fairness in the experiment. Fairness in this issue can be found by using devices such as a light sensor. The light sensor will pass through the flask, of were the reaction is taking place to a receiver. When the light sensor can not reach the receiver, the timing will be stopped automatically. This will bring fairness to experiments to test all similar to rate of reaction. ...read more.

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